213 RDS Resin Modified Glass Ionomers and...
Transcript of 213 RDS Resin Modified Glass Ionomers and...
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213 RDS Resin Modified Glass Ionomers and Compomers
Dr. Noura Shono
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Outline
• Resin Modified Glass Ionomer (RMGI)
• Polyacid-Modified Resin Composites (PAMRC)/Compomers
• Sandwich Technique
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Conventional Glass Ionomer (CGI)
• They contain: – Glass: Aluminum, fluoride, calcium, sodium and
silica – Liquid: Polyacrylic acid, polymers, copolymers
• Setting reaction: – Acid-base reaction between the glass powder and
the polyacid liquid
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• Advantages: – Long term release of fluoride
– Inherent adhesion to the tooth structure
– Good marginal seal, little microleakage
– High retention rate
– Esthetic potential
Conventional Glass Ionomer (CGI)
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• Disadvantages: – Technically demanding
– Highly sensitive to changes in water content
– Short working time, but long setting time delaying finishing procedures
– Physical and esthetic properties inferior to composites
Conventional Glass Ionomer (CGI)
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Resin Modified Glass Ionomer
• Setting Reaction
• Advantages
• Uses
• Clinical Handling
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RMGI-Setting Reaction
• Conventional GI chemistry combined with resin technology » creation of RMGI
• Dual-cured • They contain:
– Ion-leachable fluoroaluminosilicate glass in the powder
– Monomers (HEMA) – Photoinitiator, Chomphorquinone – Aqueous polyacid liquid
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• There are two forms: 1. Simple Form: Contains a water-HEMA mixture
• Slow acid-base setting reaction • Photoinitiated reaction occurs faster through
homopolymerization and copolymerization of methacrylate groups grafted on the polyacrylic acid chain and methacrylate groups of HEMA
2. Complex Form: Contains modified polyacids with methacrylate side chains which can be light polymerized
• No or little water is present
RMGI-Setting Reaction
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• A true RMGI can be defined as:
RMGI-Setting Reaction
A two part system characterized by an acid-base reaction critical to its cure, diffusion based adhesion between the tooth surface and the cement, and continuing fluoride release.
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• The mechanism of adhesion to the tooth structure is an ion exchange process.
• The Polyalkenoic acid softens and infiltrates
the tooth surface, displacing calcium and phosphate ions.
RMGI-Setting Reaction
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RMGI-Setting Reaction
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RMGI-Advantages
Compared to Conventional Glass Ionomer Handling Easier to handle Working Time Longer working time (Light
polymerization) Mechanical Properties Improved compressive, tensile &
flexural strengths Fatigue, wear resistance Fracture toughness Bond strengths to enamel & dentin Marginal adaptation, microleakage
Water Sensitivity Less sensitive to water (Early development of strength & resistance against aqueous attack) Light polymerization
Fluoride Release Equal/higher & rechargeable Esthetics, Smoothness Improved esthetics & smoothness
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RMGI
Physical properties of RMGI are still inferior to those of resin
composites
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RMGI-Uses
• Clinically: – Luting agents – Cavity liner or base – Core build-up material – Direct restorative material – Pit and fissure sealant – Provisional restorative material – Retention of orthodontic brackets – Retrograde root filling material
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RMGI
Material Manufacturer Setting mechanism Fuji II LC GC Visible light, Acid-base,
Chemical
Geristore Den-Mat Acid-base, visible light Ionosit DMG Acid-base, visible light
Photac-fil ESPE Acid-base, visible light
Vitremer, Vitrebond 3M Visible light, Acid-base,
Chemical
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RMGI- Clinical handling
• Hand mixed (powder/liquid) or mechanically triturated (Capsulated)
• May be place in bulk – Dual characteristics
• Acid conditioner
• Dentin adhesive system
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• Contoured & polished immediately after polymerization – Diamond, carbide finishing burs – No. 12 blade – Polishing with disks, impregnated rubber points or
cups and polishing pastes – Placement of unfilled resin after polishing
RMGI- Clinical handling
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• Setting Reaction
• Uses
• Clinical Handling
PAMRC (Compomers)-Setting Reaction
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PAMRC (Compomers)-Setting Reaction
• Designed to combine the esthetics of resin composites and fluoride release and adhesion of GIC
• Light initiated • They contain:
– Alumino-silicate glass – Bisglycidyl ether dimethacrylate (bisGMA), Urethane
dimethacrylate (UDMA), Triethylene glycol dimethacrylate (TEGDMA)
– Carboxyl groups attached to the resin backbone of the composite
– Photoinitiatoe, Chomphorquinone
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• Do not contain water • Do not set in the dark • Designed to absorb water to promote a
secondary neutralization reaction (allow GI setting reaction to proceed, acid-base reaction)
• Packaged in airtight foil packs to prevent ingress of water vapor
PAMRC (Compomers)-Setting Reaction
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• Considered to be hydrophobic • Lack the ability to bond to the tooth structure • Significantly lower fluoride release compared
to GI • Examples:
– Dyract, Dentsply – Compoglass, Vivadent
PAMRC (Compomers)-Setting Reaction
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• Clinically: – Class I – Class II – Class V – Fissure sealants – Retention of orthodontic brackets
PAMRC (Compomers)-Uses
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• Same as conventional composite restorations: – Acid etching procedure – Adhesive bonding – Finishing and polishing procedures
PAMRC (Compomers)-Clinical Handling
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Sandwich Technique
• Used in class V, class II or class III restorations
• Combines the fluoride release of CGI or RMGI and excellent esthetics of composite resin
• Advantages: – Lessen polymerization shrinkage of resin
composite by lessening the bulk of the material – Fluoride release reduces the chances of recurrent
caries – Better seal at dentin or cementum margins
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• Open Sandwich: The CGI or RMGI is carried to the gingival margin if it is on dentin or cementum. The enamel margins are etched and the restoration is completed with a dentin adhesive and composite
• Closed Sandwich: The dentin is covered with CGI or RMGI then entirely veneered with composite
Sandwich Technique
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Sandwich Technique
Closed Sandwich Technique
Open Sandwich Technique
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Closed Sandwich Technique in class II restorations
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Closed Sandwich Technique in class II restorations
CGI or RMGI
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Closed Sandwich Technique in class II restorations
Composite CGI or RMGI
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Open Sandwich Technique in class II restorations
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Open Sandwich Technique in class II restorations
CGI or RMGI
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Open Sandwich Technique in class II restorations
Composite
CGI or RMGI
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Sandwich Technique
The depth of the premolar lesion has approached the cemento-enamel junction
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Sandwich Technique
37 % Polyacrylic acid RMGI is placed gingivally After polymerization the entire cavity is etched with phosphoric acid
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Sandwich Technique
Application of adhesive agent First increment of composite
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Sandwich Technique
Final occlusal increment Excess composite along the axial margins is removed with finishing disks. The disks are inserted laterally into the proximal space and are used to cut back the excess marginal height
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Sandwich Technique
The tip of an Enhance polishing point is used to reduce the marginal ridge
Completed RMGIC sandwich restoration on the premolar
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Sandwich Technique
Completed restorations display the appropriate physiological contours
Postoperative view of the restorations 26 months later
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Thank You!
Any Questions?